Alarm bell for windows, doors, etc.



Patented Dec. 27, 1949 UNITED STATES PATENT OFFICE ALARM BELL FOR WINDOWS,"DOORS. ETC.

Alfred R. Euler, New York, N. Y. I

Application February 21, 1948, Serial No. 10,047

5 Claims. 1

This invention relates to new and useful improvements in rotary bells, of the kind which may be employed, for instance, for giving an audible alarm that a housebreaking attempt is being made. Rotary bells have other uses, such as those mentioned in U. S. Letters Patent No. 2,417,297, issued to me on March 11, 1947; and it is contemplated that the improvements ofthe present invention may be used in any or all of these connections.

A rotary bell, as pointed out in said patent, is one in which the bell is Vsounded by rotation of a handle or wheel; and the rotary bell of said patent, embodied vas a burglar alarm, is characterized by certain novel and valuable features, among which are a ringing of the 'bell regardless o'f the speed at which its rotating parts are turned, the giving of this signal regardless of in which direction said rotating parts are turned, and generally a simple and reliable mechanism, in combination with means for permitting easy installation of the device on windows, doors, drawers of cash registers and the like.

The 'object of the present invention is to `retain the above and other advantages of the concept of said patent, and yet further simplify the vdevice, While strengthening the Working parts thereof, reducing the cost of manufacture of various parts, and making easier the assembly of all the parts.

According to the present invention, a combination of parts is provided wherein, for one thing, there is substituted, for what is called the crossbar of the construction shown in said patent, an easily fabricable plate or strap, which may be a metal stamping; and which strap, although a non-rotative part as is said cross-bar, is secured, not to a fixed post (called the shaft in said patent), but, instead, to a fixed planiform element forming the circular top of a hub formation of comparatively large diameter upstanding from a mounting bracket for the device. While a xed post is used, this for mounting the non-rotative bell-cup, the casing of the device, this constituting its main rotatable part, has a large central circular aperture sleeving such hub, thereby permitting said casing to be rotatably mounted on the bracket in a Way to properly hold the parts to rigidly maintained relative dispositions While lpermitting easy rotation of the casing on the bracket.

Also according to the present invention, for another thing, la, single spring means, this pref erably a coil-spring, vfor resiliently biasing aplu- 'rallty vof fclapper or hammer carrying lpivot'ed 15!! arms, is substituted'for a plurality of leaf springs cularly arranged plurality of spaced elementsv carried by the casing. for coacting With an arms tiltable 'member to cause ringing -of the bell during turning of the casing.

Said elements are Yprojections upstanding from the rotatable .part .just referred to, this .part being said casing. According to said patent, these projections, which should be of small diameter, are pins having to be given a considerable height; whereas, ,according to the present `invention, said .projections may be of relatively low height, due to the fact that a tiltable member may have its eld of oscillation in a plane so close to fthe Wall of the casing from which the projections extend that the bottom of the tiltable member may actually be in contact with said wall.

Because of the advantage last-mentioned, said 'Y projections may be provided as 10W teats fOrmed up from 'and integral with the casing.

Various `other simplifications and improve..

ments 'will be pointed out or become apparent hereinafter. For further comprehension of the invention,

and of the objects and advantages thereof, refer.

ence will be Vhad tc the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying Vdrawings forming a material part of this disclosure- Fig. 1 is a fragmentary elevational view, showing a window of the sliding sash type, equipped *1' withv a device constituting an embodiment of the invention as nowv favored.

2 Iis, on a somewhat 'enlar'ged scale, a vertical section taken on the line 2 2 of Fig. l,

Fig. 3 is a top plan View of said device, with the bell-cup removed.

4 shows the parts of Fig. 3 in perspective.

Fig. 5 'is a vtransverse,vertical section, takenon ,y

the line --frfof Fig. 8.

Fig'f 'is aperspe'ctive View showing the Strap Y l aforesaid.'

Fig. 7 is a similar view showing one of the arms aforesaid.

Fig. 8 is a similar View showing one of the tiltable members aforesaid.

Fig. 9 is an axial sectional view through the casing.

Fig. 10 is a view similar to Fig. 7, showing a modiiication of said arm.

Referring to the drawings more in detail, and rst to Figs. 1 and 2, a window is illustrated having an upper sliding sash I5, guided between rails I6 and I1, a lower sliding sash I8, guided between the rail I1 and a rail I9, and a window-frame ZIJ on which the rails I6, I1 and I9 are mounted.

The device pursuant to the invention, marked as a whole 2|, is here illustrated as of the type adapted to be secured to either of the sashes I5 or I8. Said device is shown as secured to the lower sash I8. This securement is by means of a spring in the form of a substantially L-shaped strip of spring steel 22, attachable by use of screws 23. Said spring is normally resiliently biased, as indicated at 22a in Fig. 2, so that when the screws 23 are tightly applied, the device 2| will bear, at a knurling or other roughage on the external cylindrical surface of a cup-like casing 24, and with some pressure, against the upper sash I5; said casing being rotatively mounted on an L-shaped bracket 25 riveted to the spring 22 as at 26.

Thus when either the upper sash I5 is lowered or the lower sas-h I8 is raised, the casing 24 will be rotated.

Referring to Figs. 3-7, the main portion of the bracket 25 is circularly upset to provide a lov.7 cylindrically upstanding hub formation 21, and a post 28 is riveted at its bottom to said bracket (see Fig. 5), so as to extend upward fixedly from the center of such hub.

Due to the hub 21, the casing 24, apertured at its center, as shown in Fig. 9, to the same diameter as that of said hub, and sleeving the hub at said aperture, may be given a most advantageous journalling support on the bracket 25; once the aforesaid strap, this marked 30, is attached to the hub 21. This attachment may be spot welded, or, as here shown, by rivets 3|, the shanks of which traverse apertures 32 (Fig. 6) through said strap. Where spot welding is used, the apertures 32 will be omitted. This strap has reduced opposite end extensions 33 having downturned lips 34, these extensions are apertured at 35, and midway along the length of the strap it has an aperture 35a for engaging about the post 28. The bottoms of the lips 34 engage the outer limits of -the casing as shown in Fig. 5.

For reception by the apertures 35 of the strap there are trunnions 35, formed upon arms 31. Two of these arms are provided, each oscillably mounted by way of its trunnion 36 in one of the apertures of the strap 30.

Each of these arms 31 has oscillably mounted thereon a tiltable member 39 for coaction with pin-like projections 40 arranged in uniformly spaced relation along a circle concentric with the axis of rotation of the casing 24 and integrally formed up from said casing. These projections 40 may be quite short, as the members 39 have their undersides in face-wise contact with the casing.

Each tiltable member 39, moreover, instead of being an attenuated, almost needle-like element as in said patent, is of substantially equilateraltriangular outline, so that ample strength and long life againstwearare assured. E ach member 39 is oscillably mounted on its arm 3 1, by

means of an integral pin 4| formed on each tiltable member 39, with such pin 4I received in the aperture 42a of said arm. Further, the opposite sides of the broad base of a member 39 coact with 5 downbent portions of its carrying arm (which portions, marked 43 and 44 in Fig. 7, constitute the ends of a hump 42), to provide stops for limiting the amplitude of oscillation of said member 39; giving a much simplified, less expensive and more rugged construction for the purpose.

The terminal portions 33-34 of the strap 30 (Fig. 6) providing humps analogous to the humps 42, coact at their lips 34 with shoulders presented by lateral projections 45 from the arms 31, in providing stops for limiting the amplitude of oscillation of the arms 31, which carry the clappers or hammers. Said hammers are merely terminal disc-like enlargements 46 at the ends of the arms remote from their tiltable members 39.

In order resiliently to urge both arms 31 to swing their ends carrying the tiltable members 39 inward toward the projections 40 upstandingv from the casing 24, a single coil spring 41 is all that is employed; this connected at opposite ends to hooks 48 one formed up from each arm 31.

The post 28 has an upper reduced threaded extension 48, for carrying the bell-cup 49; the latter having a central aperture through whichsaid extension passes. The bell-cup is secured on the post by way of a nut 59, either a separate piece orv forming part of the bell-cup, and having an internal thread matching that of the extension 48.

As in said patent, the tiltable members 39 snap into and out of engagement with one projection 40 and then enter between the next pair of said projections, during rotation of the casing 24 in either direction, and so, for each revolution of said casing, both hammers 46 sharply strike the bell-cup as many times as there are projections 40 present.

Referring to Fig. 10, the modiiied form of arm here shown, and marked as a whole 31', has elements 36', 42', 42a', 43', 44', 45', and 48' respec- 45 tively corresponding to the portions 36, 42, 42a,

43, 44, 45 and 48 of an arm 31. The arm 31' is made of spring steel, and carries a suitably added piece constituting a hammer. Such hammer may be a stud riveted to the arm at the end thereof 50 opposite to its end provided with the hump 42.

A short portion of the length of the arm is substantially perpendicularly upwardly bent as at 5I, and at an intermediate point along the arm between said bend and the hammer, the arm is twisted through 90 as at 52 so as to add a mounting of extra resiliency for the hammer.

`While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modications coming within the scope of the invention as dened in the appended claims.

Having thus described my invention, what I Y claim as new, and desire to secure by United States Letters Patent is:

1. A rotary bell comprising, an L-shaped bracket provided centrally with an upset hub portion, a resilient member forsupporting saidn bracket on a window, a cup-like casing rotatably mounted on said L-shaped bracket and provided externally thereof with knurled roughage, a shaft non-rotatably secured centrally'to .f said bracket to extend vertically therefrom,` an"k elongated strap member mounted intermediates'.

of its ends on said vertical shaft and secured to the hub of said bracket with the ends thereof overlying said casing, a pair of arcuate arms pivotally mounted on said strap member, a tiltable member mounted on one end of each of said arcuate arms and on opposite sides of said strap, resilient means interconnecting said arms at points adjacent their attachment to the tiltable members, a clapper hammer formed on the other end of each of said arcuate arms, and projections formed integrally with said casing to project upwardly therefrom and arranged in a circle concentric with said vertical shaft and in abutting alignment with the tiltable members mounted on said arms for the purpose described.

2. In a bell, a bracket formed With a circular projecting hub portion, a cup-like casing formed with a central opening through which said hub portion projects for rotatively supporting said casing on said bracket, an elongated strap member secured to said hub portion and overlying the inner face of said casing rotatively retaining said casing in position on said hub portion, arcuate arms pivotally supported intermediate of their ends upon the ends of said strap member, a clapper formed on one end of each of said arcuate arms, resilient means interconnecting said arms on the sides of said pivots opposed to the ends of said arms formed with said clappers, projections formed on said casing between said arcuate arms and said hub portion to turn with said casing when said casing is rotated relative to said bracket, and a tiltable member mounted on the other end of each of said arcuate arms to be successively engaged by said projections as said casing rotates to successively pivot said arms against the action of said resilient means.

3. In a bell, a bracket formed with a circular projecting hub portion, a cup-like casing formed with a central opening through which said hub portion projects for rotatively supporting said casing on said bracket, an elongated strap member secured to said hub portion and overlying the inner face of said casing rotatively retaining said casing in position on said hub portion, arcuate arms pivotally supported intermediate of their ends upon the ends of said strap member, a clapper formed on one end of each of said arcuate arms, resilient means interconnecting said arms on the sides of said pivots opposed to the ends of said arms formed with said clappers, projections formed on said casing between said arcuate arms and said hub portion to turn with said casing when said casing is rotated relative to said bracket, and a tiltable member mounted on the other end of each of said arcuate arms to be successively engaged by saidl projections as said casing rotates to successively pivot said arms against the action of said resilient means, said resilient means comprising a contraction spring.

4. In a bell, a bracket formed with a circular projecting hub portion, a, cup-like casing formed with a central opening through which said hub portion projects for rotatively supporting said casing on said bracket, an elongated strap member secured to said hub portion and overlying the inner face of said casing rotatively retaining said casing in position on said hub portion, arcuate arms pivotally supported intermediate of their ends upon the ends of said strap member, a clapper formed on one end of each of said arcuate arms, resilient means interconnecting said arms on the sides of said pivots opposed to the ends of said arms formed with said clappers, projections formed on said casing between said arcuate arms and said hub portion to turn with said casing when said casing is rotated relative to said bracket, and a tiltable member mounted on the other end of each of said arcuate arms to be successively engaged by said projections as said casing rotates to successively pivot said arms against the action of said resilient means, and means for restraining the action of said resilient means in pivoting said arcuate arms.

5. In a bell, a bracket formed with a circular projecting hub portion, a cup-like casing formed with a central opening through which said hub portion projects for rotatively supporting said casing on said bracket, an elongated strap member secured to said hub portion and overlying the inner face of said casing rotatively retaining said casing in position on said hub portion, arcuate arms pivotally supported intermediate of their ends upon the ends of said strap member, a clapper formed on one end of each of said arcuate arms, resilient means interconnecting said arms on the sides of said pivots opposed to the ends of said arms formed with said clappers, projections formed on said casing between said arcuate arms and said hub portion to turn with said casing when said casing is rotated relative to said bracket, and a tiltable member mounted on the other end of each of said arcuate arms to be successively engaged by said projections as said casing rotates to successively pivot said arms against the action of said resilient means, right angular lips formed on the ends of said strap member and spaced from the outer peripheries of said arms, and laterally extending projections formed on the outer peripheries of said arcuate arms on the sides of the pivots of said arms opposed to the points of attachment of said resilient means to engage the adjacent sides of said lips and limit the action of said resilient means in pivoting said arms.

ALFRED R. EULER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,263,678 Keesey et al Apr. 23, 1918 2,417,297 Euler Mar. 11, 1947 FOREIGN PATENTS Number Country Date 36,008 Germany July 2, 1886 

